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More work on fast css transforms

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Kovid Goyal 2021-03-17 22:51:11 +05:30
parent d0b9a0d153
commit 5b30af2216
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1 changed files with 33 additions and 0 deletions
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33
src/calibre/srv/fast_css_transform.cpp
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@ -16,6 +16,7 @@
#include <exception>
#include <stdexcept>
#include <string>
#include <functional>
// character classes {{{
static inline bool
@ -145,6 +146,7 @@ class Token {
void set_type(const TokenType q) { type = q; }
void set_output_position(const size_t val) { out_pos = val; }
bool is_type(const TokenType q) const { return type == q; }
bool is_delimiter(const char32_t ch) const { return type == TokenType::delimiter && text.size() == 1 && text[0] == ch; }
void add_char(const char32_t ch) { text.push_back(ch); }
void mark_unit() { unit_at = text.size(); }
void clear_text() { text.clear(); }
@ -161,6 +163,10 @@ class Token {
return true;
}
bool is_keyword_case_insensitive(const char *lowercase_text) const {
return type == TokenType::ident && text_equals_case_insensitive(lowercase_text);
}
void trim_trailing_whitespace() {
while(text.size() && is_whitespace(text.back())) text.pop_back();
}
@ -262,6 +268,33 @@ class TokenQueue {
}
bool process_declaration() {
bool changed = false;
bool colon_found = false, key_found = false;
std::function<bool(std::vector<Token>::iterator)> process_values;
for (auto it = queue.begin(); it < queue.end(); it++) {
if (!it->is_significant()) continue;
if (key_found) {
if (colon_found) {
if (process_values) process_values(it);
break;
} else {
if (!it->is_delimiter(':')) break; // no colon found
colon_found = true;
}
} else {
if (it->is_type(TokenType::ident)) {
key_found = true;
if (it->text_equals_case_insensitive("font") || it->text_equals_case_insensitive("font-size")) {
process_values = std::bind(&TokenQueue::process_font_sizes, this, std::placeholders::_1);
}
} else break; // no property key found
}
}
return changed;
}
bool process_font_sizes(std::vector<Token>::iterator) {
bool changed = false;
return changed;
}